CEFAS2bc2aa29-1249-487c-a719-b730a2662996 English dataset Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk pointOfContact 2021-12-16T12:15:33 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Testing Modifications to the Net Grid in the Farne Deeps Single Rig Nephrops fishery 2019/20 - Fisheries Science Partnership FSP Report 65 Testing Modifications to the Net Grid in the Farne Deeps Single Rig Nephrops fishery 2019/2020 2020-12-03 publication 2021-12-16 revision 2020-11-16 creation CEFAS20927 https://data.cefas.co.uk This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The aim of this project was to further develop a selective Net Grid trawl with two cod ends to improve performance and enable skippers to better match their catch compositions to their quota allocations. The information from the trials will help skippers adapt to the Landing Obligation by avoiding unwanted fish in a fishery identified as having relatively high discard rates and will demonstrate to managers the level of selectivity improvement that is currently achievable to help formulate Discard Plans. The specific objective was to modify the escape area in the Net Grid to retain selected commercial species and minimise catches of unwanted fish. This was achieved by conducting field trials of a modified Net Grid trawl with two cod ends – a lower cod end to retain primarily the *Nephrops* and an upper cod end to retain and select for commercial fish. At each station sampled, shot and haul, positional and times information were recorded, and for all species of fish length distribution data were taken. Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk originator Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk custodian Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk distributor Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) data.manager@cefas.co.uk owner Department for Environment, Food and Rural Affairs (DEFRA) defra.helpline@defra.gov.uk owner notPlanned Fish Biota abundance, biomass and diversity Fisheries SeaDataNet P03 parameter discovery vocabulary 2011-03-25 revision Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Water column SeaVoX Vertical Co-ordinate Coverages 2010-05-18 revision Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 publication data.gov.uk MEDIN metadata record availability 2012-01-11 publication otherRestrictions noLimitations otherRestrictions Adherance to the Cefas Data access policy required. Terms and conditions of OGL – Open Government Licence apply. `http://www.nationalarchives.gov.uk/doc/open-government-licence/`_ .. _`http://www.nationalarchives.gov.uk/doc/open-government-licence/`: http://www.nationalarchives.gov.uk/doc/open-government-licence/ English biota -2.00 0.00 54.50 55.25 2019-10-01 2019-10-31 Binary Unknown https://data.cefas.co.uk/view/20927 Cefas Data Portal download The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. Data is available in the following formats: Binary download. dataset INSPIRE Data Specification on Species Distribution – Technical Guidelines 2013-12-10 publication false See the referenced specification Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication true See the referenced specification The trawler LUC SN36 was chartered to undertake trials in a *Nephrops* (*Nephrops norvegicus*) fishery. Twelve days of fishing trials were conducted in the Farne Deeps (ICES Rectangles: IVb; 38E8 and 39E8) fishing grounds off the North-East coast of England in October 2019. This enabled catch comparisons of three upper cod ends of varying mesh size and twine thickness to be examined in a single rig trawl with a selective Net Grid modification. Different upper cod ends were tested to select for the fish that were separated from *Nephrops* by the Net Grid, while the lower cod end was unchanged. A total of 28 hauls were completed, with 27 valid for analyses. Catches from the two cod ends were always kept separate. The lower cod-end was then delivered into the empty hopper and processed. The crew sorted the catch as they would normally; with the exception that all material usually discarded was retained in baskets for sampling as the “discard fraction”. Processed wanted catch and unwanted catch from each cod end were kept separate till all quantities and details had been recorded. Cefas observers sampled using standard techniques. For each haul, all fish species caught were measured to the nearest cm below. Sub sampling was necessary on occasions when the fish catch was large, but sub samples reflected the total catch composition and raising factors were calculated. MEDIN 3.1.1